netdev - [RFC PATCH 4/9] virtio_net: remove xdp related info from page_to

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Message-Id: <20221122074348.88601-5-hengqi@linux.alibaba.com>
Date:   Tue, 22 Nov 2022 15:43:43 +0800
From:   Heng Qi <hengqi@...ux.alibaba.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [RFC PATCH 4/9] virtio_net: remove xdp related info from page_to_skb()

For the clear construction of multi-buffer xdp_buff, we now remove the xdp
processing interleaved with page_to_skb() before, and the logic of xdp and
building skb from xdp will be separate and independent.

Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio_net.c | 41 +++++++++-------------------------------
 1 file changed, 9 insertions(+), 32 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index d3e8c63b9c4b..cd65f85d5075 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -439,9 +439,7 @@ static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 				   struct receive_queue *rq,
 				   struct page *page, unsigned int offset,
-				   unsigned int len, unsigned int truesize,
-				   bool hdr_valid, unsigned int metasize,
-				   unsigned int headroom)
+				   unsigned int len, unsigned int truesize)
 {
 	struct sk_buff *skb;
 	struct virtio_net_hdr_mrg_rxbuf *hdr;
@@ -459,21 +457,11 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 	else
 		hdr_padded_len = sizeof(struct padded_vnet_hdr);
 
-	/* If headroom is not 0, there is an offset between the beginning of the
-	 * data and the allocated space, otherwise the data and the allocated
-	 * space are aligned.
-	 *
-	 * Buffers with headroom use PAGE_SIZE as alloc size, see
-	 * add_recvbuf_mergeable() + get_mergeable_buf_len()
-	 */
-	truesize = headroom ? PAGE_SIZE : truesize;
-	tailroom = truesize - headroom;
-	buf = p - headroom;
-
+	buf = p;
 	len -= hdr_len;
 	offset += hdr_padded_len;
 	p += hdr_padded_len;
-	tailroom -= hdr_padded_len + len;
+	tailroom = truesize - hdr_padded_len - len;
 
 	shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 
@@ -503,7 +491,7 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 	if (len <= skb_tailroom(skb))
 		copy = len;
 	else
-		copy = ETH_HLEN + metasize;
+		copy = ETH_HLEN;
 	skb_put_data(skb, p, copy);
 
 	len -= copy;
@@ -542,19 +530,11 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 		give_pages(rq, page);
 
 ok:
-	/* hdr_valid means no XDP, so we can copy the vnet header */
-	if (hdr_valid) {
-		hdr = skb_vnet_hdr(skb);
-		memcpy(hdr, hdr_p, hdr_len);
-	}
+	hdr = skb_vnet_hdr(skb);
+	memcpy(hdr, hdr_p, hdr_len);
 	if (page_to_free)
 		put_page(page_to_free);
 
-	if (metasize) {
-		__skb_pull(skb, metasize);
-		skb_metadata_set(skb, metasize);
-	}
-
 	return skb;
 }
 
@@ -917,7 +897,7 @@ static struct sk_buff *receive_big(struct net_device *dev,
 {
 	struct page *page = buf;
 	struct sk_buff *skb =
-		page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0, 0);
+		page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
 
 	stats->bytes += len - vi->hdr_len;
 	if (unlikely(!skb))
@@ -1060,9 +1040,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 				rcu_read_unlock();
 				put_page(page);
 				head_skb = page_to_skb(vi, rq, xdp_page, offset,
-						       len, PAGE_SIZE, false,
-						       metasize,
-						       headroom);
+						       len, PAGE_SIZE);
 				return head_skb;
 			}
 			break;
@@ -1116,8 +1094,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
 	rcu_read_unlock();
 
 skip_xdp:
-	head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
-			       metasize, headroom);
+	head_skb = page_to_skb(vi, rq, page, offset, len, truesize);
 	curr_skb = head_skb;
 
 	if (unlikely(!curr_skb))
-- 
2.19.1.6.gb485710b